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International General Certificate of Secondary Education
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
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MARK SCHEME for the October/November 2008 question paper
0652 PHYSICAL SCIENCE
0652/03
Paper 3 (Extended), maximum raw mark 80
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the
examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the
details of the discussions that took place at an Examiners’ meeting before marking began.
All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’
scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated.
Mark schemes must be read in conjunction with the question papers and the report on the examination.
•
CIE will not enter into discussions or correspondence in connection with these mark schemes.
CIE is publishing the mark schemes for the October/November 2008 question papers for most IGCSE, GCE
Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.
Page 2
1
Mark Scheme
IGCSE – October/November 2008
Syllabus
0652
Paper
03
(a) (i) use of weight = mass x g ;
= 2.0 N ;
1
1
2
(ii) 2.0 N OR same as (i) ;
1
1
(b) arrow vertically upwards ; (allow without label if clear)
1
1
(c) marked clearly between 5.0 & 5.5 N ;
1
1
(d) (i) 1.9 ± 0.1N ;
1
1
1
1
2
(ii) use of force = mass x acceleration ;
= 9.5 m/s2 ;
[Total: 8]
2
(a) (i) coating with zinc ;
1
1
(ii) zinc is more reactive than iron ;
when both exposed to water and oxygen zinc corrodes/reacts ;
protecting the iron/sacrificial corrosion ;
1
1
1
3
(iii) painting ;
1
1
(iv) for paint/oil/grease etc: no, if scratched the iron rusts/
OR for stainless steel: yes, because protection is throughout the
alloy not just on the surface
1
1
(b) aluminium has an oxide layer ;
which prevents contact between the metal and oxygen/air/water ;
1
1
2
(c) (i) makes it stronger ;
1
1
(ii) atoms of second metal get between aluminium metals in lattice/atoms
of the two metals are of a different size ;
1
making it more difficult for layers of atoms to slide ;
1
2
[Total: 11]
© UCLES 2008
Page 3
3
Mark Scheme
IGCSE – October/November 2008
Syllabus
0652
Paper
03
(a) the liquid moves up the capillary tube ;
because it expands ;
1
1
2
(b) (i) iron, copper, constantan ANY TWO
1+1
2
(ii) temperature = 100 × 4.8/7.2 ;
= 67 oC ;
1
1
2
(ii) quick acting OR
can measure higher temperatures OR
can be remote … ;
1
low thermal capacity or can follow changing temps OR
metals used have Higher melting points than glass OR
wires can be as long as required ;
1
2
[Total: 8]
4
(a) 2,8,8,1 ;
2,8,8 ;
2,5 ;
1
1
1
3
(b) number of electrons in outer shell ;
same as Group number
1
1
2
(c) (i) CaI2 ;
1
1
1
1
1
1
2
(ii) black (accept dark grey/blue) ;
(d) (i) boiling point increases ;
with increase in proton number/down Group ;
(ii) helium is less dense than air so will float/carry balloon up ;
argon and krypton are more dense than air so will not float/will sink ;
neon only slightly less dense than air, will not give enough uplift/will
not make balloon rise ;
1
1
1
3
[Total: 12]
© UCLES 2008
Page 4
5
Mark Scheme
IGCSE – October/November 2008
Syllabus
0652
Paper
03
(a) waves refracted on entering shallow water ;
refraction correct ;
wavelength in deep water constant AND in shallow water ;
(if only 3 wavefronts drawn max. 2, 2 drawn max 1)
1
1
1
3
(b) (i) part circles centred gap ;
not reaching barrier ;
wavelength constant throughout ;
(if only 3 wavefronts drawn max. 2, 2 drawn max 1)
1
1
1
3
1
1
(ii) diffraction ;
[Total: 7]
6
(a) (i) causes acid rain/causes smog ;
damages buildings/trees/makes breathing difficult ;
(two answers must match, otherwise max 1)
any two
(ii) speeds up reduction of nitrogen oxide ;
to form nitrogen ;
1
1
1+1
2
1
1
2
(b) C3H8 = (3 × 12) + (8 × 1) = 44 and CO2 = 12 + (2 × 16) = 44 ;
1
44 kg propane produces 3 × 44 = 132 kg carbon dioxide ;
1.0 kg propane produces 132/44 = 3.0 kg carbon dioxide ;
1
1
44 g carbon dioxide has volume 24 dm3 ;
3.0 kg carbon dioxide has volume 1000 × 3.0 × 24/44 = 1636 dm3 ;
1
1
5
one mark each for:
a shared pair of electrons ;
four shared pairs of electrons, two for each oxygen ;
four other electrons on each oxygen ;
1
1
1
3
(c)
[Total: 12]
© UCLES 2008
Page 5
7
Mark Scheme
IGCSE – October/November 2008
Syllabus
0652
Paper
03
(a) cracking ;
of an alkane/oil/petroleum ;
1
1
2
(b) C2H + H2O → C2H5OH ;;
one mark for each side
2
2
(c) a catalyst/named catalyst ;
1
1
[Total: 5]
8
(a) Use of power = VI
I = 200 000 000/55 000
= 3 600 A
1
1
1
3
(b) (i) less energy loss (in cables) ;
(same power transmitted) at lower current ;
1
1
2
(ii) transformer ;
1
1
(iii) use of n1/n2 = V1/V2 ;
= 220 : 1 ;
1
1
2
(d) energy input = energy output ;
1
1
[Total: 9]
9
(a) electron ;
fast/energetic/from the nucleus ;
1
1
2
(b) (i) nucleon numbers correct:131 0 ;
proton numbers correct: 54 –1 ;
1
1
2
1
1
2
1+1
2
(ii) xenon ;
noble gas ;
(c)
shortish half life OR Xe unreactive
long enough to do tests etc. but not too long to harm patient
beta correct sort of penetration
ANY TWO
[Total: 8]
© UCLES 2008